ZETRON 4000 Series, Installation Manual

Page: 229 / 418

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Spectracom NETCLOCK Set Up
Figure 43: Two System Channels
Program Channels A and B as custom channels. When asked for the custom tone or
current, specify the desired value. Generally, Channel A will have an “F1” tone (1950 Hz)
or current (+5 mA), and Channel B will have an “F2” tone (1850 Hz) or current (+12.5
mA) upon transmit only.
Spectracom NETCLOCK Set Up
The Spectracom NETCLOCK may be used as an input to the Model 4048 and Model 4020
for the time-of-day clock. The NETCLOCK connects through the Clock Service Port. The
Clock Service Port connections are described in Wiring to the Service Ports on page 102.
The NETCLOCK supported baud rates are described in Configuring the System Traffic
Card (STC) on page 41.
The NETCLOCK must be configured for Format 1 operation.
The Model 4048 and Model 4020 will automatically detect the NETCLOCK.
Base Station
Dual Channel Card
2 Freq
Xmitter
1
st
Rcver
2
nd
Rcver
2-Wire Tx/Rx
4-Wire Rx
Channel B (RX #2)
Busy Output
Busy/Mute Input
2-Wire Tx/Rx
Channel A (RX #1)
4-Wire Rx NC
Channel B Configuration:
2-Wire Termination = low impedance
Config Switch 3 (x-mute) = on
Channel A Configuration:
2-Wire Termination = high impedance
Config Switch 7 (x-mute) = on
Busy Output
Busy/Mute Input
Note In the above configuration the 2-wire Rx should be turned down
(CCW), so that RX #1 is not heard.